Improvement in saws



' liutrd- (gisten SIMON W. SHAILEB, Oll DEEP RIVER, CONNECTICUT.

Letters Patent No. 105,261,1Zatedrully 12,1870.

IMPROVEMENT IN SAW-s.v

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern:

Be it known that I, SIMON W. SHAILER, of Deep River, inthe town of Saybrook, State of Connecticut, have invented an Improvement in Saws for Cutting Ivory; and I do hereby declare that the following is a full and exact description thereof, which will enable others skilled in the art to make and use the same, ret-,I erence being had to the accompanying drawings, and tothe letters of reference marked thereon.l

My invention relates to the class of saws constructed with a plate increasing in thickness toward the center or back, and consists in making the rim of said" plate thin, and supporting it with teeth of different lengths, bent in such relation to each other'that the shorter teeth shall make a wider kerf than the longer, and allow the longer teeth to co-operate with the bev-V eled plate in preventing the vibration of the saw, to enable it to operate with less width of cut and save a portion ot' the stock operated upon, and produce a smooth surface onihe work. l

I construct the plate of my circular saw inthe usual form, that is, with the standing or face side flat, and the oppositev vside beveled outwardly or diverging from the edge of the plate or a line near the edge, to the shaft, and apply thereto the usual driving att-achment and guides to steady it, but further guard itl against vibration by providing it with vrelatively long and short teeth alternating with each other singly or otherwise, and bending the shorter teeth so that theyv may make a wider kerf than thc-longer, as illustrated in Figure 1 of the accompanying drawings, in which the short teeth are shown at A, and the long 'at B, and are represented on an enlarged scale,l with out reference to their practical proportions, to more clearly represent their relations.

This arrangement enables the short teeth to free that portion of the long which comes within their radius, in consequence ot' which 'the long teeth require but little if any set, and make a narrow kerf in which they check the vibration of the thin edge of the plate, and cause it to runtrue with the thick center or body, andthe saw is thereby enabled to clear itself with less set, and nish its Work more smoothly than when made in the ordinary proportions.

But this arrangement of the teeth also admits of a vthinner rim to the saw-plate than it has heretobre been practical to use, as by it the labor is divided between the two sets of teeth, and vibration is checked at the extreme diameter of .the saw, where it can be less eected by guides or the thick body of the plate; and the greater elasticity of the short teeth, thus made thin, enables them to track more perfectly, and prevents them from scoring the work deeply.

Relative specimens of work are illustrated by Figvures 2`and 3, fig. 2 being the sketch of a piece of ivory cut by an ordinary saW, and having in it the representation of a kerf, A' B', as made by the arrangement of teeth before described; and fig. 3, the sketch of a similar' piece ot' ivory cut for a piano-key facing by a saw constructed according to my improvement. 'lhe practical Anumber ot' teeth to the inch for doing similar work may vary from fourteen to eighteen. Figures 4 and 5 show an exaggerated view of. like teeth applied to a straight saw. In such application the back of the saw should be suiciently thickto make lit run true, and then the arrangement of teeth represented, in connection with the back of the saw, will check the Vibration f the edge when made very thin, and enable it to operate in line with the back.

I disclaim the combination and arrangement of teeth of different lengths, as follows:

First, when the long and short teeth are bent to an equal set.

Second, wllen the long teeth are ben-t and the short left straight.

Third, when the short a wider track than the log.

Fourth, when the short teeth are split sov as to cut a wider` trackv than the log.

What I claim fas my invention, and desire to-sccure byl Letters ]?atent,is

A saw, beveled as described, and provided with teeth of diierent lengths, A and B, when the shorter teeth are benttorange beyond the longer laterally, as and for the purposes hereinbefore described.

SIMON W. SHAILER.

Witnesses:

JOHN CHILD, S. H. WILDER.

teeth are upset so as to cut 

